Abstract

The features of phase-formation mechanisms (PFMs) inherent to various temperature stages of surface phase creation are discussed with the locality of thermostimulated surface heterosegregation processes taken into account. The contributions of diffusion and sublimation processes to PFMs are estimated. It is demonstrated that pressure (vacuum) affects diffusion, adsorption, sublimation, and chemical reactions during thermostimulated segregation. The segregant type and inclination to segregation are predicted for compounds with a substantial difference between the partial pressures of the vapors of constituent components. The general PFM on the composite-oxide surface as a result of segregation is proposed.

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